Vanitha C, Bhaskar Reddy K, and Satyanarayana SV. “Quality-by-Design Approach to Selective Stability Indicating RP- HPLC Meth-Od Development and Validation for Estimation of Sofosbuvir in Bulk Drug”. International Journal of Research in Pharmaceutical Sciences, Vol. 9, no. 2, Apr. 2018, https://pharmascope.org/ijrps/article/view/186.